<template>
  <div class="sidebar">
    <el-menu class="sidebar-el-menu" :default-active="onRoutes" background-color="#324157"
             text-color="#bfcbd9" active-text-color="#20a0ff" unique-opened router>
      <template v-for="item in items">
        <template v-if="item.subs">
          <el-submenu :index="item.index" :key="item.index">
            <template slot="title">
              <i :class="item.icon"></i><span slot="title">{{ item.title }}</span>
            </template>
            <template v-for="subItem in item.subs">
              <el-submenu v-if="subItem.subs" :index="subItem.index" :key="subItem.index">
                <template slot="title">{{ subItem.title }}</template>
                <el-menu-item v-for="(threeItem,i) in subItem.subs" :key="i" :index="threeItem.index">
                  {{ threeItem.title }}
                </el-menu-item>
              </el-submenu>
              <el-menu-item v-else :index="subItem.index" :key="subItem.index">
                {{ subItem.title }}
              </el-menu-item>
            </template>
          </el-submenu>
        </template>
        <template v-else>
          <el-menu-item :index="item.index" :key="item.index">
            <i :class="item.icon"></i><span slot="title">{{ item.title }}</span>
          </el-menu-item>
        </template>
      </template>
    </el-menu>
  </div>
</template>

<script>
  export default {
    data () {
      return {
        items: [
          {
            icon: 'el-icon-lx-home',
            index: 'dashboard',
            title: '系统首页'
          },
          {
            icon: 'el-icon-lx-sort',
            index: 'order',
            title: '预约管理'
          }, {
            icon: 'el-icon-lx-present',
            index: 'event',
            title: '活动管理'
          },
          {
            icon: 'el-icon-lx-cascades',
            index: 'cate',
            title: '分类管理'
          }, {
            icon: 'el-icon-lx-text',
            index: 'article',
            title: '文章管理'
          }, {
            icon: 'el-icon-lx-pic',
            index: 'case',
            title: '案例管理'
          }, {
            icon: 'el-icon-lx-settings',
            index: 'company',
            title: '企业信息管理'
          },
          {
            icon: 'el-icon-lx-friend',
            index: 'admin',
            title: '管理员管理'
          },
        ]
      }
    },
    computed: {
      onRoutes () {
        return this.$route.path.replace ('/', '');
      }
    },
    created () {
      // 通过 Event Bus 进行组件间通信，来折叠侧边栏
      // bus.$on('collapse', msg => {
      //     this.collapse = msg;
      // })
    }
  }
</script>

<style scoped>
  .sidebar {
    display: block;
    position: absolute;
    left: 0;
    top: 70px;
    bottom: 0;
    overflow-y: scroll;
  }

  .sidebar::-webkit-scrollbar {
    width: 0;
  }

  .sidebar-el-menu:not(.el-menu--collapse) {
    width: 250px;
  }

  .sidebar > ul {
    height: 100%;
  }
</style>
